Samurai Army Structure...

 I picked up some of the Samurai figure drawings from the Junior General images (for printing as paper soldiers - see https://juniorgeneral.org/index.php/figure/figureList/renaissance#10 ); they've been used to represent each of the groupings I'll be using for my Samurai armies.

Mounted Samurai (probably 16 per side in 4 groups of 4)

Each of the main blocks of Teppo (musket) and Yari (spear) will have their own group command

Then there will be squads for Elite Samurai (1), Samurai Spear Armed (3), Ashigaru Spear (3), and Ashigaru Musket/Archer (4).

The army could look something like this when deployed...